Electric lamp



hama July 21, 193s UNITED STATES lmacrix'rc LAMP .raul o. csi-iin, cleveland Heights, ohio, as- 'signor to General Electric Company, a corporation oi' New York Application 18, 1935, Serial No. 2,397

' y schim. (c1. 17e-a9) My invention relates to electric lamps and more particularly to incandescent lamps of the double-ended tubular type such as those disclosed in my United States Patent application Serial 5 No. 667,011, iiled 'April 20, 1933, now Patent One of the objects of my invention is to provide in a lamp oi the type referred to, terminal elements for conveniently mounting the lamp which are of simple design and allow the arrangement of a series of lamps end to end without intervening structures that would interrupt the line o! iight.

Advantages of myinvention are simplicity of 15 lampl design, ruggedness of construction and economy of manufacture. Further features and advantages will appear from the following description ofvspecies thereof and from the drawing.

. In the drawing, Fig. l is a longitudinal section 2 0 through a lamp comprising` my invention; Fig. 2 is an end view thereof; Fig. 3 is a partial elevation and section of a pair o! lamps mounted end to end in a socket; Pig. 4 is a partial elevation and 25. section M three lamps having a modified form of terminal'elements and mounted end to end in sockets; Fig. 5 is a section takenbetween a pairV ofthelampsinlllgni; ll'ig.iiisanelevationnfa modiiled terminal element; Figs. 'I and 8 are side M and'end views of a lamp with another modified terminal element; and Pig. 9 is a side view of a lamp with still another modified terminal element.

Referring to Fig. 1, the lamp comprises a tubuil and numerico tneendthereofasendwsns for the envelope. 'Ihe said discs are preferably of the type disclosed in my prior application herelinbefore referred to, and consist preferably of a o metal or alloy. such as a chrome-iron alloy, which has the same coemcient oi' expansion as glass -and willsealeasilytcglassbyfusion. l'brmountin'g andsupplyingcurrenttothelampeachofsaid.

'discs basa terminal'eleinent in theform of a pronglland Ilsecuredtheretoandextendlng iaterallyofthebulb Il.. Asshowhinthedravlns, the'said prongs Il and Il may be made integral withthediscs. 4

The internal structure orfmount of the lamp w includes a filament Il. which extends substantially the entire length of the bulliy and is electrically connectedateachendtoone of thediscs II, I2. One end of said illament is secured to `theendofasupportwlx'e Ilwhichhasatransu versclyextendingsemi-circularportion Il which lar glass bulb or envelope Il having'metal discs,

may be welded to the inside of the disc I I. The opposite end of the support wire is embedded in one end of a glass stay rod It. The other end of the lament I5 is secured to a short support wire I9 which is in turn secured to a support wire' 5 2li. ,Y One end of said support wire 20 is embedded in the ,end of the stay rod I8 and the opposite end is bent in the Aform of a transverse circular por-v .l tion 2| surrounding anl inwardly formed depression 22.at the center of the disc I2. Thenla- 10 ment I 5 is supported at intermediate points by support wires -23 each of which has an end em. bedded in the glass stay rod I8. The bulb I0 is .exhausted through an opening 24 at the center of the depression 22 in the disc I2. The exhaustl5 lng is performed by means of a glass tube (not shown) sealed to the disc I2 around the opening 24,'after which a portion oi' the said tube is fused down to-a solidv mass 25 to seal the said opening, the said glass seal 25 being shelteredin the re- 2o cess 22. The discs II, I2 may be provided with a suitable insulating cover or coating (shown at 26 in dotted lines).

To mount the lamp, the prongs I2, I4 are inserted in any'suitable form of socket having ter- 26 minals for engaging said prongs. The prongs*- may be provided with holes 2 29 which engage spherical protuberances on t e" socket terminals. Two lamps are shown in Fig. 3 mounted in end to end relation in a double socket 29. The socket 30 illustratedcomprises upper and lower portions 2l, 3| held together by a threaded pin 22. 'I'he prongs I2, I4 on the lamp engage with resilient terminal members 23, 24 in slots 2l, 3l in the socket. The said terminal members 22, 24 may 35 Vbe formed from a single piece of metal bent to a U-shape and secured to the lower portion 3| of the socket by a tubular rivet II.'l y K The adjacent ends oi' the lamps Il are con-l nected to the same side oi' the current supply line 40 through the socket terminals 33, 3|, alternate sockets 2l being connected to opposite sides of the line. As shown in Fig. 3, the construction describedpermits placing the ends ofthe lamps .very close together or even in contact with each u other, thus practically eliminating the uniighted space between adjacent lamps.

rigs. und 5 illustrate a modmcatlan in which the lamps 28 have -discs 39, 40, similar to the discs II, I2, sealed to the ends of the bulb.

' lProngs 4I l2 extend laterally from the periphery of said discs similar to the prongsV I2, Il except that they are twisted at right angles so that the j faces of the socket engaging portions are in a plane passing through the longitudinal oit tneiampbulb. 'mpermitemeuseefwckets 43 each having a Slot widened ln' the direction of the lamp axis and containing a single resilient metal terminal member 4l adapted. to engage both prongs 4| and 42 at the ends of adjacent lamps as shown in Fig. 4.l It will be apparent .from the drawing that this'construction allows Figs. 7 and 8 illustrate another modiilcation'h wherein the prong 50 on the disc 5| has a protuberance 52 which engages with a depression in the terminal member of a socket. Fig. 9 illustrates still another another modification in which the prong 53 on the disc M is made resilient or iiexible by virtue of a U-shaped loop portion 55.

The various forms of terminal prongs may, of course, be formed from separate pieces of metal secured to the discs bytwelding or otherwise and the said discs may in each case have a covering 0r coating of insulating material, such as an insulating enamel, sprayed or otherwise coated thereon, or a cap of insulating material secured 1 thereto.

What I claimras new and4 desire to secure by Lettersrliatent of the United States is:

l.- An electric lamp comprising a tubular glass bulb having a substantially flat metal disc sealed to each end thereof as an end wall closure therefor and a laterally extending mounting and terminal prong portion integral with each of said discs 2. An electric lamp comprising a tubular glass bulb having a substantially ilat metal disc sealed to each end thereof as an end wall closuretherefor and a 'laterally extending mounting and terminal prong portion secured to each of said discs.

3. An electric lamp comprising a tubular glass bulb lhaving a metal disc sealed to each end thereof as an end wall therefor and a. iiat laterally extending lmounting and terminal prong portion secured to eeen of said dises, the mees er said prongs being located substantially in a plane passing through the longitudinal axis of said bulb.

4. An electric lamp comprising a tubular glass bulb having a metal disc sealed to each end there- 90 nat metal disc secured to each end of said bulb u and deemeauy connected te an end of said me! ment and a laterally extending metal mountingv and terminal member secured to each of said discs.

' PAUL "0. CARTON. u 

